Concept:Sequencing sentences in a paragraph requires linking the clue words and ideas in a logical time order.
Explanation:S1 states that lantana is not native to India.
This idea is naturally followed by R, which tells how and when it was introduced: by the British in the 1800s as an ornamental plant.
P starts with "Since then," which directly refers to the introduction in R and describes its spread over six lakh square kilometres.
S adds a specific recent data point from 2020, showing that lantana occupies forty percent of forests, including tiger reserves.
Q extends the damage by adding that research also shows lantana has invaded most pasture lands.
S6 then concludes by saying eradicating this widely spread plant is a long and arduous process.
Thus, the correct logical order is S1, R, P, S, Q, S6.
Answer:B. RPSQ